BorgWarner Inc. and Consolidated Subsidiaries Consolidated Statements of Equity (USD $) In Millions, except Share data, unless otherwise specified	Total		Issued common stock	Common stock held in treasury	Capital in excess of par value	Retained earnings	Accumulated other comprehensive income (loss)	Noncontrolling interests
Beginning Balance at Dec. 31, 2009			$ (1.2)	$ (57.9)	$ (1,034.1)	$ (1,193.4)	$ (14.5)	$ (37.4)
Beginning Balance, shares at Dec. 31, 2009			118,336,410
Treasury Stock, Shares				(7,769,762)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared								(9.5)
Stock option expense					0.1
Stock incentive plans				22.6	43.5	(10.6)
Shares outstanding under option, exercised	1,888,000		1,020,375	525,297
Executive stock plan				11.5	3.8
Executive stock plan, shares				269,896
Net issuance of restricted stock					18.9
Net issuance of restricted stock, less amortization, shares			1,749,796
Purchase of treasury stock				(325.7)
Net earnings attributable to BorgWarner Inc.	377.4					377.4		18.8
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(68.2)
Comprehensive income (loss) attributable to the noncontrolling interest	2.5
Purchases of treasury stock, shares				(7,066,100)
Net earnings attributable to the noncontrolling interest, net of tax	(18.8)
Capital contribution from noncontrolling interest	0
Dytech Ensa, S.L. acquisition								2.0
Ending Balance at Dec. 31, 2010			(1.2)	(349.5)	(1,100.4)	(1,560.2)	53.7	(51.2)
Ending Balance, shares at Dec. 31, 2010			120,086,206
Treasury Stock, Shares	(12,801,243)			(12,801,243)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared								(22.0)
Stock incentive plans					38.7
Shares outstanding under option, exercised	1,033,000
Executive stock plan					6.8
Executive stock plan, shares			104,205
Net issuance of restricted stock					15.0
Net issuance of restricted stock, less amortization, shares			104,919
Purchase of treasury stock				(357.6)
Net earnings attributable to BorgWarner Inc.	550.1	[1]				550.1		20.5
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(97.1)
Comprehensive income (loss) attributable to the noncontrolling interest	(1.3)
Purchases of treasury stock, shares				(5,031,481)
Net earnings attributable to the noncontrolling interest, net of tax	(20.5)
Capital contribution from noncontrolling interest	19.5							19.5
Adjustments to capital in excess of par value					(26.6)
Purchase of subsidiary shares from noncontrolling interest								2.8
Ending Balance at Dec. 31, 2011	(2,453.0)		(1.2)	(707.1)	(1,134.3)	(2,110.3)	150.8	(65.1)
Ending Balance, shares at Dec. 31, 2011			121,315,705
Treasury Stock, Shares	(7,450,460)			(7,450,460)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared								(18.9)
Stock incentive plans					52.0
Shares outstanding under option, exercised	784,000		777,925
Executive stock plan					39.3
Executive stock plan, shares			538,180
Net issuance of restricted stock					21.2
Adjustments Related to Tax Withholding for Share-based Compensation				(18.1)
Net issuance of restricted stock, less amortization, shares			391,349
Shares Paid for Tax Withholding for Share Based Compensation				(241,250)
Purchase of treasury stock				(295.9)
Net earnings attributable to BorgWarner Inc.	500.9	[1]				500.9
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	29.5
Comprehensive income (loss) attributable to the noncontrolling interest	2.8
Stock Issued During Period, Shares, Conversion of Convertible Securities	11,400,000			11,382,771
Adjustments to additional paid in capital, equity component of convertible debt	243.5				(243.5)
Conversion of convertible securities, value of shares issued	617.3			617.3
Treasury stock received from bond hedge, shares	(6,500,000)			(6,489,698)
Adjustments to additional paid in capital, bond hedge	503.9				503.9
Treasury stock received from bond hedge, value	(503.9)			(503.9)
Treasury stock issued due to settlement of warrant, shares	4,900,000			4,854,654
Adjustments to additional paid in capital, warrant	338.5				(338.5)
Treasury stock issue due to settlement of warrant, value	338.5			338.5
Purchases of treasury stock, shares				(4,155,694)
Net earnings attributable to the noncontrolling interest, net of tax	(21.5)							(21.5)
Capital contribution from noncontrolling interest	0
Adjustments to capital in excess of par value					(8.0)
Purchase of subsidiary shares from noncontrolling interest								7.0
Ending Balance at Dec. 31, 2012	$ (3,146.1)		$ (1.2)	$ (569.2)	$ (1,160.7)	$ (2,611.2)	$ 121.3	$ (63.5)
Ending Balance, shares at Dec. 31, 2012			123,023,159

[1] The Company's results were impacted by the following:•Quarter ended December 31, 2012: Retirement related obligations of $17.3 million are comprised of a $5.7 million loss resulting from the settlement of a portion of the Muncie Plant's pension obligation and an $11.6 million expense associated with the retirement of certain Named Executive Officers. These obligations were partially offset by a $6.1 million tax benefit. The Company incurred tax expense of $3.9 million which included $11.1 million of U.S. tax expense to correct the income taxes payable balance, partially offset by tax benefits resulting from changes to the statutory income tax rate in certain countries and the settlement of certain tax audits. •Quarter ended September 30, 2012: The Company incurred $1.8 million of expense and $11.2 million of tax expense associated with the completion of the sale of its spark plug business. The Company also recorded restructuring expense of $27.4 million primarily associated with the disposal and future requirements of BERU's on-going business, which was partially offset by a tax benefit of $7.7 million. Additionally, the Company incurred tax expense of $6.9 million primarily resulting from the settlement of certain tax audits.•Quarter ended June 30, 2012: The Company recorded expense of $37.9 million primarily due to the write-down of prior purchase price accounting adjustments included within the disposal group as a result of signing a Master Purchase Agreement to sell the spark plug business to Federal-Mogul Corporation, which was partially offset by a tax benefit of $5.5 million resulting from the write-down. Additionally, the Company recorded tax expense of $9.0 million related to its decision to change its cash repatriation assertion for some of its foreign subsidiaries.•Quarter ended December 31, 2011: The Company incurred $21.5 million in expense associated with the loss on sale of the tire pressure monitoring business, including costs related to the divestiture, and a write-down of a portion of the ignitor and electronic business. The Company recorded $1.4 million of tax benefit associated with the disposals and $4.1 million of tax expense related to an intercompany disposal transaction.•Quarter ended June 30, 2011: The Company recorded a $29.1 million patent infringement settlement gain, net of legal costs incurred, which was partially offset by $11.0 million of additional tax expense. Additionally, the Company recorded $6.2 million related to tax adjustments resulting from a change in state corporate income tax legislation as well as an adjustment of the Company's tax accounts as a result of the closure of certain tax audits.